When you get a strange ending in any of the movies of Pokewood, your starring pokemon will be rewarded with a shiny star upon entering battle. While it is different from those sparkles of N's pokemons and shinies, it is quite something to see, cuz it means your pokemon is a movie star!
How many of your pokemons are Movie Stars? I only got three or so strange endings, so only my Gallade, Umbreon, and Volcarona received the shiny stars. What about yours?